Rear facing car seat


So just thought I’d share what a pediatrician told me (luckily not my sons normal pediatrician she was out sick) anyways she mentioned my son being tall and told me even though he is tall enough he has to be rear facing until age two which I obviously knew and told her that I plan to leave him rear facing longer than age 2 and she told me my son is to tall for that and she suggested I definitely move him front facing at 2 stating he would be far to uncomfortable.

Why would she say that to me anyways curious what all of you think or would of said lol also my son is 18 months old